Magnetization Dynamics Changes of Dysprosium(III) Single-Ion Magnets Associated with Guest Molecules

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• 作者：Sheng Zhang ; Hongshan Ke ; Lin Sun ; Xin Li ; Quan Shi ; Gang Xie ; Qing Wei ; Desuo Yang ; Wenyuan Wang ; Sanping Chen
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：April 18, 2016
• 年：2016
• 卷：55
• 期：8
• 页码：3865-3871
• 全文大小：445K
• 年卷期：0
• ISSN：1520-510X

文摘

Two Dy(III) single-ion magnets with a trigonal dodecahedron (D_2d) for 1 and an approximately square-antiprismatic (SAP, D_4d) N₂O₆ coordination environment for 2, formulated as [Dy(Phen)(tfmb)₃] (1) and [Dy(Phen)(tfmb)₃]·0.5(1,4-dioxane) (2) (tfmb = 4,4,4-trifluoro-1-(4-methylphenyl)-1,3-butanedione, Phen = 1,10-phenanthroline), were obtained. Therein, complex 1 was transformed to 2 in 1,4-dioxane solution. Structural analysis shows that complexes 1 and 2 have differing local symmetry of Dy(III) ions. Magnetic studies indicate that the barrier heights (ΔE/k_B) of 1 and 2 are 63.56 and 102.82 K under zero dc field as well as 118.50 and 164.55 K under 1200 Oe dc field, respectively. Based on the frequency dependencies of the ac susceptibilities, the effective barriers (ΔE/k_B) and the pre-exponential factors (τ₀) are 67.05 K and 4.57 × 10^–6 s for 1 and 95.88 K and 2.39 × 10^–7 s for 2 under zero dc field. The present work illustrates that guest-determined notable structure change results in different barrier heights.